Can anyone explain to me how that works? Like, I buy each of the modules that I would want and then what do I do? I'm am totally lost but this seems like a solution to my problem of not being able to find a tube amp for all of my styles.

theres the amp then there are different modules that you plug in bad thing to compare it too but think of a spider 3 amp it has different modules and then channels this is the same thing but a million times better